월요일 Monday. 월 is a Sino-Korean element meaning ‘moon, month’
화요일 Tuesday. 화 is a Sino-Korean element meaning ‘fire’
수요일 Wednesday. 수 is a Sino-Korean element meaning ‘fire’
목요일 Thursday. 목 is a Sino-Korean element meaning ‘tree, wood’
금요일 Friday. 금 is a Sino-Korean element meaning ‘metal, gold’.
토요일 Saturday. 토 is a Sino-Korean element meaning ‘earth’.
일요일 Sunday. 일 is a Sino-Korean element meaning ‘sun, day’.
This is a simple system of ”one month” to “twelve month” but watch out for June where 육 has lost its ㄱ and October where 십 has lost its ㅂ:
일월 January
이월 February
삼월 March
사월 April
오월 May
유월 June
칠월 July
팔월 August
구월 September
시월 October
십일월 November
십이월 December